docs: def emissive_part_3x(self, tb=True):
          """Get the emissive part of the 3.x band"""
          try:
              # Emissive part:
              self._e3x = self._rad3x_t11 * (1 - self._r3x)
              # Unsure how much sense it makes to apply the co2 correction term here!?
              # FIXME!
              # self._e3x *= self._rad3x_correction
  
          except TypeError:
              LOG.warning(
                  "Couldn't derive the emissive part \n" +
                  "Please derive the relfectance prior to requesting the emissive part")
  
          if tb:
              return self.radiance2tb(self._e3x)
          else:
              return self._e3x